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Thermostat question

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Jon in Iowa

06-18-2003 20:57:24




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I am wanting to know the symptoms of a tractor with a sticking thermosat. I know it would be hard to determine if it is a cracked head or head gasket or a thermostat. The reason I asked is today I was using the Super M to spray, and traveled 3 miles which at the end there was anti-freeze coming out, 2-3 hours later when it had cooled off I checked the radiator and there was antifreeze still showing, I proceded to return home and went 2 miles and foam started to come out of the radiator, another 1/2 mile and the foam stopped and the gauge was in the middle of the the gauge, not reading hot, the remainder of the trip it run fine and acted like normal. I have had the tractor for 4 years and last winter I had the radiator redone. It just seems odd that it does this at random. Thinking it might be the thermostat,anyway I hope it is. Any reply would be more than welcome.It did not freeze up last winter. Thanks

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Hugh MacKay

06-19-2003 05:28:08




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 Re: Thermostat question in reply to Jon in Iowa, 06-18-2003 20:57:24  
Jon: Yesterday was ptobably quite a warm day in Iowa. I would bring the rad up to about 2.5 " from cap. Start the tractor with cap off and watch for bubbles. If you are getting presure from a head gasget leak that is causing it to expell the coolant you should see some bubbles. Also watch for traces of oil in the coolant and vice versa. Try this first, then go to thermostst.

On the thermostat, take it out and put it in a pot on stove. Bring the water to a boil, and take pot and contents to good light. Best if you have a thermometer. As it cools down make note at what temp the thermostat closes. If bad enough you may not even need the thermometer, especially if thermostat is closed right from the boil. It should be opening and closing in the 180 to 200 degree range. Try these items let us know how you make out.

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Ken K.

06-22-2003 13:55:33




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 Re: Re: Thermostat question in reply to Hugh MacKay, 06-19-2003 05:28:08  
Hugh, here is something that happened to me with my MD. When I bought the MD about a year and a half ago, the thermostat was stuck open so I bought a new thermostat and just for the heck of it I put in a pot of water and heated it to boiling. The thermostat never opened or if it did, it wasn't very much open. I thought about taking it back to the CIH dealer but then decided to put it in anyway. (I also put new original IH type gauges on the MD.) When I start the MD the temperature gauge goes to the edge of the white and green and stays there. Varies very little no matter how cold or hot out side or the work I do with it. (Don't work the MD very hard though. Cut hay with the haybine and bale.) Just my experence with the boiling water and thermostat! Ken

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Hugh MacKay

06-22-2003 16:49:41




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 Re: Re: Re: Thermostat question in reply to Ken K., 06-22-2003 13:55:33  
Ken: I have only ever done this a dozen or so times and really just want to satisfy myself the thermostst will indeed open. I have never tried it wth a new one. I find you have to catch them quite quickly coming off the boil, or they will close before you see what is going on. I am not a trained mechanic, just trying to take a practical look at a problem. I somehow wonder if being under presure as in the engine does have some effect. Also years ago we though if an engine was getting up to 180 degrees you best watch it closely. Today and the only modern application I ever seem to be around with a guage are big diesels in trucks. Those are set so the fan doesn't even start until 205-210 degrees. I have been told by the powers that be, in the case of a truck diesel not to worry if it stays below 225. I guess boil isn't what it used to be.

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dan

06-19-2003 04:39:09




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 Re: Thermostat question in reply to Jon in Iowa, 06-18-2003 20:57:24  
It may have just had too much in it for the temp it was running at at that time. Yesterday I had to run mine about 10 miles away to the shop I work at so I can do a little maintenance and it burped a little antifreeze along the way too but it was also the first time I had gone down the road in 4th gear like that in quite a while and it hasn't even been run hardly in a year. Outside temp was a little over 100 deg. The coolant temp was normal, it just had to make room due to expansion of the antifreeze. I am thinking of rigging an overflow bottle to it since I had to modify so much else it really doesn't matter for originality anymore. I hope that is the problem on yours. Not even really a problem.

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Jon in Iowa

06-19-2003 06:45:24




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 Re: Re: Thermostat question in reply to dan, 06-19-2003 04:39:09  
Thank you for your reply. So a sticky thermostat will make the radiator overflow, is this right. I checked this morning and the antifreeze is still showing in the radiator. I sure appreciate the information from you all.



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